Road-roller



(No Model.) .Bheets-Sheet 1.

M. E. HERSHEY.

ROAD ROLLER.

Patented July 28, 1891.

3 sheetssheet 2.

NO Model.)

M. E. HERSHEY.

ROAD ROLLER.

Patented July 28, 1891.

m: mum Pi'rzu cm, mam-mum, msmmsm 3 Sheets-Sheet 3.

(No Model.)

M. E. HERSHEY.

I ROAD ROLLER. No. 456,567. Patented July 28, 1891.

6 w x A M w .1 m N n1 P 1 Y (M V IUQN LP Q Wm (III a Ill \N. N h g N \rmv \N y W2 UNITED STATES PATENT OFFICE.

, MARTIN E. HERSHEY, OF HARRISBURG, PENNSYLVANIA.

ROAD-ROLLER.

SPECIFICATION forming part of Letters Patent No. 456,567, dated July 28,1891.

Application filed February 18,1891. Serial No. 381,957- (No model.)

To all whom it may concern.

Be itknown that I, MARTIN E. HERSHEY, of Harrisburg, in the county ofDauphin and State of Pennsylvania, have invented certain new and usefulImprovements in Road- Rollers; and I do hereby declare the following tobe a full, clear, and exact description of the same, reference being hadto the accompanying drawings, forming a part of this specificatiomand tothe letters of reference marked thereon.

This invention relates particularly to improvements in that class ofmachines employed in rolling the surfaces of roadways or picking thesame up, which are self-impelled by means of a steam-engine forming partof the machine, although applicable to any ordinary traction-engine andthe object of the invention is to provide an improved cylinder-mountingand construction by which the machine is made more compact, rigid, andthe parts more convenient of access, and

further enabling the cylinders, dome, and connected parts to be set upand put in perfect alignments before being mounted on the machine, itonly being then necessary to couple on the connecting-rods and securethe cylinders in place to put the parts in running order.

The invention consists-in certain novel details of construction andcombinations and arrangements of parts to be hereinafter described, andpointed out particularly in the appended claims.

In the accompanying drawings, Figure 1 is a side elevation of aroad-roller constructed in accordance with my invention. Fig. 2 is atransverse vertical section through the boiler-cylinders, steam dome,chest, and chamber. Fig. 3 is a top plan view of the enginemountingsremoved from the machine. Fig. 4 is a central longitudinal verticalsection looking toward the right, Fig. 2, and showing one valve and itsconnections with the link and tumbler-shaft. Fig. 5 is a horizontalsection through the cylinders, steam-chest, and valve-chambers. Fig. 6is a face view of one of the guide-yokes.

Similar letters of reference in the several figures indicate the sameparts.

The machine illustrated in the drawings,

and which embodies my present invention,

The boiler A, with its attached fire-box and rear extension B for thetank and fuel supplies, constitutes the main frame or body of themachine, the broad guide-roller 0 being connected thereto by theextended fore end or head B in which is socketed to turn horizontallythe fork or yoke B, carrying the journals of the guide-roller. Theroller is turned by means of the chains Z), drun1-shaft b, and rod-wormand hand-wheel 17 The main or drive wheels D are mounted on a shaft (1,passing through between the boiler and tank, and carrying also thegearwheels cl, deriving their motion from the small gears (Z driven bysuitable gearing and connections from the crank-shaft E.

Crank-shaft E and the shafts carrying the gearing aforesaid are alljournaled in bearings held by the side plates 6 in a well-understoodmanner, and to the front of these plates is bolted what I shall term thespectacle-Y plate F, having suitable apertures therein, through whichthe connecting-rods between the piston slide and crank-shaft and the.

links and eccentrics work.

The cylinders, as will be inferred from the foregoing, are mountedforward of the spec tacle-plate, and in the present instance I design toform both cylinders, the saddle for holding the same in place on theboiler, the valve-chambers and the seat for the steamdome in a singlecasting, with a passage at the bottom communicating with the boiler andpassing through the casting to a point above the level of the cylinders,where it opens into the dome.

By reference to Figs. 2, 3, at, 820., it will be seen that a base orsaddle G, conforming to the outer surface of the boiler, is provided andformed integral therewith. Above the same are the steam-cylinders l-l,one at each side, with a space between them constituting thevalve-chestvH. Below the level of the valve-chest is a steam-chamber Hwhich, through an opening 7t, communicates directly with the top of theboiler, and from the top of this chamber two passages h it pass up wardthrough the steam-chest and open into the annular base 7L2 of thesteam-dome. From this dome the steam enters the valve-chest through thethrottle-valve I and opening t. On the annular seat 71, is secured bybolts or otherwise the steam-dome 7L3, which may, if desired, beprovided with a cover of any approved pattern, and at the top issurmounted by a whistle, safety-valve, or other appropriate device. Thesaddle or base G is extended forward some little distance and is formedinto a flat seat 9, to which the casting G, forming the bearing for thevalve-rod and tumbler-shaft, is secured.

I prefer to employ ordinary piston-valves, as shown clearly in Fig. 4,the steam-ports from the valve-chest to the cylinders being formed inthe casting; but immediately adj acent the valves are located hardenedbushings h in which the openings are also formed, as will be readilyunderstood by those skilled in the art.

I provide piston-heads K for the piston having forward projections 71;,between which the usual stuffing-box is located, and connected to theseprojections are the slideguides K, one at top and bottom of eachcylinder, and each pair united at the outer end by a guide-yoke K whichhas a central aperture, and when the parts are assembled, as will behereinafter described, is bolted fiat against the spectacle-plate.

In assembling the parts going to make up the engine proper, and which itwill be understood is done before mounting on the roller, the pistonsand valves with their rods are fitted and placed in position in theusual way, the slide-guides are rigidly secured in place with the yokesat the outer end, the slides placed in position, and the parts alignedand fitted up ready for operation. The bearings L for the valve-rods arepreferably somewhat enlarged to accommodate the enlarged end of saidrods to prevent, as much as possible, the

wear by reason of the side-thrust of the link movement, and when thevalve-rods are in position the links M are mounted in place andconnected by the links M with the crank-arms M on the tumbler-shaft Mwhich has been previously mounted in the bearings L on the casting G,which latter, as before stated, is secured rigidly in place on theforward extension of the saddle.

The throttle-valve stein passes out through the front of the dome, andis operated by means of small lever O, pivoted on a small projection onthe cylinder-casting and having an operatingrod- 0 passing back to apoint within reach of the engineer.

When the parts have been assembled and set up in proper alignment, theyare ready to be mounted on the roller, which may then be done, and thewhole secured in place by bolts G passing into the boiler-shell, carebeing had that the opening h in the bottom of the casting shall registerwith a corresponding opening in the boiler-shell, and when this has beendone a screw-threaded sleeve ,0 is screwed into the opening h andset-nuts O placed on its outer end to firmly clamp the boilershellaround the opening, giving a steam-tight joint and preventing anyweakening of the shell at this point.

, The guide-yokes K,when the cylinders are mounted in position, abutagainst the spectacle-plate and are secured firmly thereto, any slightspace left between the two being filled in with spelter and the wholebolted in place, after which it is a simple matter to make theconnections with the connecting-rods P and link-rods P in the ordinarymanner.

The tumbler-shaft is operated by means of the downwardly-extendingcrank-arms p, as shown in dotted lines, Fig. 1, the rod passing back,and the hand-lever 1), to which said rod is connected, the segment andlocking-pawl being preferably provided for holding the hand-lever andtumbler-shaft in position.

Both piston-valves are made hollow all the way through, and the exhaustpasses from the forward end through the valve and from the rear enddirectly to the rear end of the valvecasing, where each casing opensthrough one arm of a Y-connection of the exhaust-pipe Q, which passesdirectly into the smoke-stack, as shown clearly in Fig. 1.

The herein-described construction of cylinder and mountings will be seento possess many advantages in connection with this and analogousmachines subjected to heavy strains and liable to have the base-linechanged at any moment and the water thrown violently about, for thesteam is not taken directly from the boiler to the cylinders, but firstpasses above the same into the steam-dome, and thence through thethrottle to the cylinders, overcoming all danger of entrained Waterbeing carried into the cylinder or to the valve-chamber.

The advantages of this structure and arrangement over and above thosejust mentioned result from the fact that the cylinders are brought intointimate relation with the live-steam chamber at the bottom with livesteam on one side and above them in position to prevent condensation toany material degree, and, further, the cylinders themselves contributelargely to the efficiency of the engine by absolutely preventing anycondensation in the valve-chambers or steam-chest, which latter isentirely surrounded by steamspaces of one form or another except at theends. So, too, by providing the steam-chamber immediately above theboilernot only is entrained water caught, but there is afforded a verymuch larger live-steam space than could be secured from the dome alone,and the cylinders therefore have ample space from which to draw theirsupply. By locating the dome above the valve-chest instead of forward ofthe cylinders, as is usual, an additional advantage is secured, inasmuchas the machine may be foreshortened and the exhaust be passed directlyfrom the valvecasings to the stacks without impediment, enabling largerengines to be employed.

Having thus described my invention, what I claim as new is 1. In aroad-roller, the combination, with boiler, wheels, and complementaryparts, of the saddle mounted directly on the boiler, the two cylindersformed integral therewith, one on each side, the valve-chest between thecylinders, having seats forboth valves therein, the steam-dome above thevalve-chest, and the passages leading from the boiler through thevalve-chest to the dome and from the lat ter into the said chest,substantially as described.

2. In a road-roller, the combination, with the boiler, Wheels, andcomplementary parts, of the saddle mounted directly on the boiler, thetwo cylinders formed integral therewith, one at each side, with thevalve-chest between them, the dome-seat above the chest and thesteam-cylinder below the same, the dome mounted on said seat, andpassages leading from the boiler to the steam-chamber and passages fromthe latter through the valvechest to the dome and from the latter intothesaid chest, substantially as described.

3. In an engine-mounting for road-rollers, the combination, with thesaddle adapted to fit the boiler, the cylinders connected rigidlytherewith, the valve-chest between the cylinders, and the steam-domemounted above said chest, of the slide-guides connected rigidly to thecylinders, and the guide-yokes rigidly connecting the outer ends of theguides on each side, said parts being assembled and aligned before beingmounted on the machine, substantially as described.

4. In an engine-mounting for road-rollers, the combination, with thesaddle adapted to fit the boiler, the cylinders formed integraltherewith on each side with the valve-chest between them, and thesteam-dome above said chest, of the forward extension of the saddlehaving the seat formed thereon, and the casting having the bearings forthe tumbler-shaft and valve-rods thereon, substantially as described.

5. In an engine-mounting for road-rollers, the combination, with thesaddle adapted to fit the boiler and having the forward extension withseat thereon, the cylinders formed integral with the saddle, with thevalve-chest and steam-chamber between the cylinders, of thedome mountedabove the chest, passages leading from the boiler to the steam-chamber,from the latter to the dome, and from the dome to the valve-chest, thecasting having the bearings for the valve-rods, and tu mbler-shaftmounted on the seat at the front of the saddle, the slide-guidesconnected rigidly to the MARTIN E. HERSHEY.

Witnesses:

EUGENE SNYDER, JOHN GASTROCK.

